US4315772A - Process for steel production and converter for carrying out the process - Google Patents
Process for steel production and converter for carrying out the process Download PDFInfo
- Publication number
- US4315772A US4315772A US06/129,731 US12973180A US4315772A US 4315772 A US4315772 A US 4315772A US 12973180 A US12973180 A US 12973180A US 4315772 A US4315772 A US 4315772A
- Authority
- US
- United States
- Prior art keywords
- nozzles
- burners
- converter
- oxygen
- charge material
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000000034 method Methods 0.000 title claims abstract description 23
- 230000008569 process Effects 0.000 title claims abstract description 22
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 11
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 8
- 239000010959 steel Substances 0.000 title claims abstract description 8
- 239000001301 oxygen Substances 0.000 claims abstract description 45
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 45
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 38
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 36
- 239000000463 material Substances 0.000 claims abstract description 30
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 26
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 26
- 238000002844 melting Methods 0.000 claims abstract description 21
- 230000008018 melting Effects 0.000 claims abstract description 21
- 229910052742 iron Inorganic materials 0.000 claims abstract description 19
- 239000000969 carrier Substances 0.000 claims abstract description 9
- 239000007789 gas Substances 0.000 claims description 17
- 239000007787 solid Substances 0.000 claims description 16
- 239000000155 melt Substances 0.000 claims description 10
- 230000001681 protective effect Effects 0.000 claims description 8
- 239000000446 fuel Substances 0.000 claims description 7
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 6
- 238000002485 combustion reaction Methods 0.000 claims description 6
- 239000000126 substance Substances 0.000 claims description 6
- 229910052786 argon Inorganic materials 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 238000007664 blowing Methods 0.000 abstract description 8
- 229910000805 Pig iron Inorganic materials 0.000 abstract description 6
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 8
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 5
- 235000011941 Tilia x europaea Nutrition 0.000 description 5
- 239000004571 lime Substances 0.000 description 5
- 238000009835 boiling Methods 0.000 description 4
- 239000003345 natural gas Substances 0.000 description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000009970 fire resistant effect Effects 0.000 description 3
- 238000013021 overheating Methods 0.000 description 3
- 239000002893 slag Substances 0.000 description 3
- 239000004215 Carbon black (E152) Substances 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 229930195733 hydrocarbon Natural products 0.000 description 2
- 150000002430 hydrocarbons Chemical class 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 239000000161 steel melt Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 239000012159 carrier gas Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- -1 for example Substances 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen(.) Chemical compound [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000011573 trace mineral Substances 0.000 description 1
- 235000013619 trace mineral Nutrition 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/42—Constructional features of converters
- C21C5/46—Details or accessories
- C21C5/48—Bottoms or tuyéres of converters
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/30—Regulating or controlling the blowing
- C21C5/34—Blowing through the bath
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C2007/0093—Duplex process; Two stage processes
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Definitions
- This invention relates to a process for the production of steel from a quantity of charge material such as iron scrap, iron sponge, or other essentially metallic iron characters, wherein a column of the charge material is inserted in solid form into a converter having a plurality of nozzles disposed in the bottom area thereof, the inserted charge material being rendered molten and overheated upon the combustion of fuel in the presence of oxygen moving in a counter current.
- the invention further relates to the converter with nozzles disposed in the bottom area thereof for carrying out the process.
- This objective is achieved by the provision of fuel-oxygen burners in a lateral wall at the bottom wall area of the converter, the burners being disposed above the nozzles located in such bottom wall area so that the charge material inserted into the converter is molten with the burners, and with the provision of a sump, finely disbursed carbon and oxygen are fed in separately of one another to the melt via the nozzles.
- the sump should be of such a depth that it can readily absorb the carbon and oxygen fed through the nozzles for the production of additional melting heat.
- the addition of heat is accomplished in the fuel chamber above the melt so that a boiling of the molten bath will be substantially avoided.
- the melting itself may be accomplished by the fuel-oxygen burners which produce hot flames beyond the sump considerably more effectively and quickly than by the burning of the carbon with oxygen which are introduced into the melt.
- the carbon fed to the melt in a finely disbursed form serves both as a protection against oxydation as well as for melting and thereafter serves for overheating of the melt as well as a reduction agent for the ferrous oxide slag produced during melting.
- the charge material be molten by the burners to the point until the latter lie below the level of the bath, the burners then being operated as nozzles.
- the burners may be submerged in the bath because of the rising level of the bath, although they will no longer be operated as burners after submerging.
- a protective gas for example, nitrogen, may flow through the burners for producing a stirring effect.
- the burners may be used for additional functions as, for example, the blowing in of oxygen which may possibly include solid substances such as lime, fines, abrasion of iron sponge, etc., or may function as a protective gas bracketting, or for the flowing in of argon and oxygen and/or natural gas, etc. possibly also containing solid substances such as finely disbursed iron carriers, coal slag, lime, etc.
- the burners may be disposed either parallel to the nozzles or at angle thereto.
- the preheating for the formation of the sump by the burners and the further melting by the supply of carbon and oxygen to the bath, possibly during an additional operation of the burners, is carried out for example to the point until about one-half the charge material has liquefied so that a bath level will result which reaches up to the burners.
- the burners After submersion into the bath, the burners will be operated as nozzles, especially as Q-BOP nozzles.
- Oil or finely disbursed carbon and especially natural gas, for example, are suitable as fuels for the fuel-oxygen burners.
- the oxygen fed in through the nozzles may be encased in a known manner by a gaseous hydrocarbon which may also serve as a carrier gas for these solid carbons.
- a gaseous hydrocarbon which may also serve as a carrier gas for these solid carbons.
- separate nozzles may be arranged for the supply of the finely disbursed carbon.
- the fuel-oxygen burners are preferably disposed to one side of the tipping axis of the converter so that, when emptying the converter, the burners will not come in contact with the bath. Otherwise, the burners may be disposed on opposite sides of the tipping axis and provision may be made for blowing a protective gas through the burners during the emptying of the converter.
- the height/diameter ratio of the present converter is at least 3:2 in order that any good shaft effect may be achieved during the melting by fuel-hydrogen burners. It may be therefore necessary to charge the material for one converter charge several times.
- the blast furnace gas which develops in the bath during the melting and during the turnover may be secondarily burnt in the upper portion of the converter by the supply of oxygen or entering air, since there develops a combustable exhaust gas from the beginning to the end of the melting.
- Another use of the exhaust gas outside the converter is also possible, whereby the heating value of the blast furnace gas may possibly be controlled by after-burning.
- solid carbon may be added with the charge material and, for certain purposes, for example, for producing analyses with little trace elements, it may be effective to add solid or possibly molten pig iron to the charge material.
- the present process is particularly effective with regard to the power balance; however, burners disposed in a lateral wall of the converter at the bottom may create problems with regard to their durability under certain circumstances. Therefore, in order to make the higher lying burners, also operable as nozzles, more easily accessible and thus more easily servicable, provision is made for the bottom of the converter to have a deeper area into which the nozzles extend as compared to an adjacent higher lying area into which the burners, operable as nozzles, extend.
- This higher lying area may surround the lower lying area concentrically or the two areas may be disposed symmetrically, and the higher lying area may have an upper surface sloping downwardly toward the lower area, with the lower lying area formed as a trough for forming a sump so that a portion of the melt will remain therein during the emptying of the converter.
- the sump has such a depth that the carbon and oxygen blown in through the nozzles is absorbed by the sump, whereby during a subsequent charge, the supply of finely disbursed carbon and oxygen through the nozzles in the lower area is utilized for the production of melting heat in addition to the heat produced by the burners.
- FIG. 1 is a vertical section schematically showing a part of a converter constructed in accordance with the invention which includes an insert at the bottom containing nozzles, burners and a sump; and
- FIG. 2 is a top plan view of the insert located at the bottom of the converter.
- converter 1 is typically bricked up with a fire-resistant material and has an insert 2 at its bottom, the insert having a central area 3 lying deeper than an adjacent higher lying area 4 annularly and concentrically surrounding the central area.
- a trough 5 is defined between the deeper lying and higher lying areas which opens into a lateral wall 7 which slightly slopes downwardly toward the trough.
- nozzles 6 Extending into the deeper lying area 3 are nozzles 6 through which oxygen for puddling or through which solid carbon in finely distributed form may be blown into a melt located in the converter.
- Nozzles 6 provided for blowing in oxygen are formed in a known manner at least as double-walled pipes so that the jet of oxygen may be surrounded by a protective medium containing hydrocarbon. Also, the jet of oxygen may contain solid substances such as finely dispensed lime, etc.
- Burners 8 may also be formed as double-walled pipes which terminate in wall 7 of higher lying area 4 so that quantities of fuel, for example, heating oil or natural gas, may be introduced through the annular space formed by the double pipes and a quantity of oxygen necessary for the combustion may be introduced through the inner pipe.
- quantities of fuel for example, heating oil or natural gas
- the charge is inserted into the converter and is rendered molten from below by the fuel-oxygen burners 8, whereby the exhaust gases formed during the melting, preheat the charge material located above the molten bath.
- a sump is formed first in trough 5 which is carborized first by finely disbursed carbon fed thereto through nozzles 6 into lower area 3 after which the supply of oxygen commences through nozzles 6 in lower area 3 for burning the finely disbursed carbon in the sump for thereby producing additional melting heat.
- the oxygen may be fed in through nozzles 6 other than those nozzles 6 used for feeding in the carbon.
- Burners 8 in the case of continuous melting will submerge into the molten bath, and a protective gas may flow through them when they are operated as nozzles or when assuming additional functions, especially the blowing in of oxygen which may include solid substances (lime, fines, abrasion of iron sponge, etc.) and encased with protective gas, for the blowing in of argon and/or nitrogen and/or natural gas, etc., which may also contain solid substances such as finely disbursed iron carriers, fine slag coal, lime, etc.
- burners 8 may be oriented at a spatial angle to the axial direction for the corresponding alignment of the flames formed thereby as well as for the production of a stirring effect after submersion.
- Insert 2 at the bottom is formed as a truncated wall for engagement with the converter with the joints therebetween being sealed by fire-resistant material.
- burners 8 terminate at an elevation higher than nozzles 6, and are as easily accessible as nozzles 6 since they are likewise disposed in insert 2.
- Higher lying area 4 may also continuously merge with lower lying area 3. And, the latter may extend in a radial direction up to the converter with which the insert is jointed, or higher lying area 4 may be formed of two sections of a segment of a circle disposed adjacent and on both sides of the lower lying area.
- FIG. 2 illustrates the tipping axis T of the converter relative to insert 2.
- Nozzles 8 may be disposed, when viewed in plan, so as to lie relative to the tipping axis to one side thereof, so that during emptying the converter by tipping it about axis T in the direction away from the burners, the burners avoid coming into contact with the molten bath. Otherwise, the burners may be disposed on both sides of axis T, and a protective gas may be provided for blowing out of the burners during the emptying of the converter to thereby avoid any clogging.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
- Manufacture And Refinement Of Metals (AREA)
Applications Claiming Priority (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2910103 | 1979-03-15 | ||
| DE2910103A DE2910103C2 (de) | 1979-03-15 | 1979-03-15 | Verfahren zur Stahlerzeugung |
| DE19792947078 DE2947078A1 (de) | 1979-11-22 | 1979-11-22 | Verfahren zur strahlerzeugung |
| DE2947078 | 1979-11-22 | ||
| DE2949717 | 1979-12-11 | ||
| DE19792949717 DE2949717C2 (de) | 1979-12-11 | 1979-12-11 | Verfahren zur Stahlerzeugung |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US4315772A true US4315772A (en) | 1982-02-16 |
Family
ID=27187908
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US06/129,731 Expired - Lifetime US4315772A (en) | 1979-03-15 | 1980-03-12 | Process for steel production and converter for carrying out the process |
Country Status (16)
| Country | Link |
|---|---|
| US (1) | US4315772A (nl) |
| AR (1) | AR219860A1 (nl) |
| AT (1) | AT384240B (nl) |
| AU (1) | AU536465B2 (nl) |
| BR (1) | BR8001515A (nl) |
| CA (1) | CA1145145A (nl) |
| ES (1) | ES488660A1 (nl) |
| FR (1) | FR2451399A1 (nl) |
| GB (1) | GB2045409B (nl) |
| HU (1) | HU182072B (nl) |
| IT (1) | IT1131426B (nl) |
| LU (1) | LU82244A1 (nl) |
| MX (2) | MX167237B (nl) |
| NL (1) | NL186331C (nl) |
| PL (1) | PL222728A1 (nl) |
| SE (1) | SE448751B (nl) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3894864A (en) * | 1972-03-04 | 1975-07-15 | Kloeckner Werke Ag | Process for the continuous production of steel from ore |
| US3897243A (en) * | 1972-03-04 | 1975-07-29 | Kloeckner Werke Ag | Smelting process and furnace |
| US3948642A (en) * | 1973-05-26 | 1976-04-06 | Klockner-Werke Ag | Method of melting and arrangement therefor |
| US3982926A (en) * | 1973-05-26 | 1976-09-28 | Klockner-Werke Ag | Method for melting charges |
| US4097028A (en) * | 1975-02-06 | 1978-06-27 | Klockner-Werke Ag | Method of melting and apparatus therefor |
| US4110108A (en) * | 1976-03-18 | 1978-08-29 | Klockner-Werke Ag | Method of producing cast iron |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE794178A (fr) * | 1972-02-02 | 1973-05-16 | Centre Rech Metallurgique | Procede de traitement des mitrailles ferreuses |
| DE2316768B2 (de) * | 1973-04-04 | 1977-03-03 | Fried. Krupp Gmbh, 4300 Essen | Verfahren zum frischen von metallen, insbesondere roheisen, und vorrichtung zur durchfuehrung des verfahrens |
| SE447911B (sv) * | 1977-05-04 | 1986-12-22 | Maximilianshuette Eisenwerk | Sett vid framstellning av stal i konverter |
| US4195985A (en) * | 1977-12-10 | 1980-04-01 | Eisenwerk-Gesellschaft Maximilianshutte Mbh. | Method of improvement of the heat-balance in the refining of steel |
| DE2816543C2 (de) * | 1978-04-17 | 1988-04-14 | Eisenwerk-Gesellschaft Maximilianshütte mbH, 8458 Sulzbach-Rosenberg | Verfahren zur Stahlerzeugung |
-
1980
- 1980-01-30 NL NL8000566A patent/NL186331C/nl not_active IP Right Cessation
- 1980-02-01 AT AT54680A patent/AT384240B/de not_active IP Right Cessation
- 1980-02-15 ES ES488660A patent/ES488660A1/es not_active Expired
- 1980-02-28 GB GB8006834A patent/GB2045409B/en not_active Expired
- 1980-03-06 AR AR28020880A patent/AR219860A1/es active
- 1980-03-11 SE SE8001897A patent/SE448751B/sv not_active IP Right Cessation
- 1980-03-12 MX MX905380A patent/MX167237B/es unknown
- 1980-03-12 MX MX18152380A patent/MX154029A/es unknown
- 1980-03-12 US US06/129,731 patent/US4315772A/en not_active Expired - Lifetime
- 1980-03-12 LU LU82244A patent/LU82244A1/fr unknown
- 1980-03-13 AU AU56405/80A patent/AU536465B2/en not_active Ceased
- 1980-03-14 BR BR8001515A patent/BR8001515A/pt unknown
- 1980-03-14 HU HU61780A patent/HU182072B/hu unknown
- 1980-03-14 FR FR8005704A patent/FR2451399A1/fr active Granted
- 1980-03-14 IT IT2068880A patent/IT1131426B/it active
- 1980-03-14 CA CA000347642A patent/CA1145145A/en not_active Expired
- 1980-03-15 PL PL22272880A patent/PL222728A1/xx unknown
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3894864A (en) * | 1972-03-04 | 1975-07-15 | Kloeckner Werke Ag | Process for the continuous production of steel from ore |
| US3897243A (en) * | 1972-03-04 | 1975-07-29 | Kloeckner Werke Ag | Smelting process and furnace |
| US3948642A (en) * | 1973-05-26 | 1976-04-06 | Klockner-Werke Ag | Method of melting and arrangement therefor |
| US3982926A (en) * | 1973-05-26 | 1976-09-28 | Klockner-Werke Ag | Method for melting charges |
| US4097028A (en) * | 1975-02-06 | 1978-06-27 | Klockner-Werke Ag | Method of melting and apparatus therefor |
| US4110108A (en) * | 1976-03-18 | 1978-08-29 | Klockner-Werke Ag | Method of producing cast iron |
Also Published As
| Publication number | Publication date |
|---|---|
| LU82244A1 (de) | 1980-06-06 |
| SE448751B (sv) | 1987-03-16 |
| BR8001515A (pt) | 1980-11-11 |
| FR2451399B1 (nl) | 1982-11-19 |
| NL186331C (nl) | 1990-11-01 |
| NL186331B (nl) | 1990-06-01 |
| AR219860A1 (es) | 1980-09-15 |
| MX154029A (es) | 1987-04-07 |
| IT8020688A0 (it) | 1980-03-14 |
| HU182072B (en) | 1983-12-28 |
| SE8001897L (sv) | 1980-09-16 |
| PL222728A1 (nl) | 1981-03-13 |
| GB2045409B (en) | 1983-03-23 |
| GB2045409A (en) | 1980-10-29 |
| IT1131426B (it) | 1986-06-25 |
| NL8000566A (nl) | 1980-09-17 |
| AU5640580A (en) | 1980-09-18 |
| AU536465B2 (en) | 1984-05-10 |
| ES488660A1 (es) | 1980-09-16 |
| FR2451399A1 (fr) | 1980-10-10 |
| ATA54680A (de) | 1987-03-15 |
| MX167237B (es) | 1993-03-11 |
| AT384240B (de) | 1987-10-12 |
| CA1145145A (en) | 1983-04-26 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| STCF | Information on status: patent grant |
Free format text: PATENTED CASE |
|
| AS | Assignment |
Owner name: KLOCKNER CRA TECHNOLOGIE GMBH 4100 DUISBURG 1 GERM Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:KLOCKNER-WERKE AKTIENGESELLSCHAFT;REEL/FRAME:004411/0531 Effective date: 19850524 |
|
| AS | Assignment |
Owner name: KLOCKNER CRA PATENT GMBH, GERMANY Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:KLOCKNER CRA TECHNOLOGIE GMBH;REEL/FRAME:005181/0477 Effective date: 19890720 Owner name: KLOCKNER CRA PATENT GMBH, GERMANY Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:KLOCKNER CRA TECHNOLOGIE GMBH;REEL/FRAME:005181/0477 Effective date: 19890720 |